Straining-cylinder for pulp.



No. 826,193. I PATENTED JULY 17, 1906.

- P. REINIOKE.

STRAINING CYLINDER FOR PULP.

APPLICATION rum) JAN 4 1906 lax en for UNITED STATES PATENT OFFICE.

STRAINING-CYLINDER FOR PULP.

Application filed January 4, 1906. Serial No. 294,582.

Specification of Letters Patent.

Patented July 17, 1906.

To all whom it may concern:

Be it known that 1, PAUL RniNIoKE, manufacturer, a subject of the'Dukeof Anhalt, residing at No. 19 Baasdorferstrasse, Kothen, in the Duchy ofAnhalt, German Empire, have invented certain new and useful Improvementsin a Quickly-Rotating Straining- Cylinder for Pul of which the followingis a specification.

The quickly-rotating straining-cylinders as constructed up to nowconsist of a cylindrical skeleton to which the sieve-plates forming themantle are secured by means of hoops in such a manner that thesieve-plates may be easily removed in order to be cleansed.

My provement relates to straining-cylinders constructed in theaforedescribed way, and in order to make my improvement more clear Irefer to the accompanying drawings, in which similar letters denotesimilar parts throughout the several views, and in which Figure 1 is alongitudinal section throu h a straining-cylinder embodying myinvention, the left-hand portion of the figure being shown in side view.Fig. 2 is a cross-section through the cylinder shown in Fig. 1. Fig. 3shows, on a larger scale, a cross-section through one of theskeleton-bars with its neighboring parts. Fig. 4 is a plan of the partsshown in Fig. 3; and Fig. 5 is a view similar to Fig. 4, but showinganother portion of the cylinder.

The skeleton of the cylinder consists generally of the two frontalrings 1) b, which are connected with each other by means of bars 0,having a cross-like section, as shown in F ig. 3, and between thefrontal rings 5 the bars 0 are connected with each other by hoops d, asshown in Fig. 1. The sieve-mantle consists generally of four partsarranged one parallel to the other, .all the parts being retained uponthe skeleton before described by hoops 6, Figs. 1 and 2. The frontalends of each sieve-plate abut tightly against the frontal rings b.

Straining-cylinders constructed in the before-described manner arepossessed by the drawback that even under uniform conditionssuch asuniform pulp, uniform rotary speed, and the liketheir manner ofoperation is not uniform, so that the effect of the straining-cylinderis comparatively low. This is, as has been ascertained, due to the factthat in order to obtain also a uniformeifect the sieve-plates must beplaced and adjusted and fixed to the skeleton in such a manner that theslots of the plates are located exactly at right angles to thelongitudinal axis of the cylinder. Where means are afforded to let theslots assume and keep this proper position, the effect of astraining-cylinder constructed in such a manner will be alwaysabsolutely uniform.

In the known straining-cylinders the sieveplates, each of which has alength of aboutthree meters, are adjusted principally by eyesight, andonly a considerably very short portion of each plate abuts a ainst therespective frontal ring of the ske eton, so that the slots of the platesassume easily a somewhat, although perhaps very slight, oblique positionwith respect to the longitudinal axis of the cylinder. Owing to thisposition, the slots act practically similar to the threads of a screw,and instead of allowing the mixture consisting of the fibers and theliquor wherein the fibers are suspended to pass through the slots in theproper way the slots in consequence of their obliqueness cause a certainportion of the fibers to move to one side of the cylinder, so that acorrespondin 1y greater quantity of liquor is required and acomparatively greater consumption of power is entailed. Now to preventthese drawbacks by letting the slots assume and keep a perfectly properposition'id est, exactly at right angles with respect to the axis of thecylinderthe longitudinal bars 0 of the skeleton are provided with lugsor other projections-for instance, ledges 1", Fig. 4, or separateprojections r, Fig. 5, or other means adapted to act as an abutment oras abutments for the sieve-plates a, so that these latter do not abutsolely at their frontal ends against the frontal rings, as hitherto, butat their longitudinal sides too. This is distinctly to be seen in Figs.4 and 5. Where there are ledges, as in Fig. 4, the lon itudinal sides,rims, or edges may be perfectfiy straight; but where there are separateprojections, such as r in Fig. 5, the sieve-plates are provided withrecesses adapted to receive the said projections. The height of theprojections, lugs, ledge-s, or the like need only be such as correspondsto the thickness of the sieve-plates a; but, in fact, I prefer to letthe ledges or the like have a somewhat greater height, so as to obtainthe further advantage that when during the rotation of the cylinderpieces of wood or other larger parts of the pulp to be purified come incontact with the sieve-plates they cannot get to the rims of the latter,whereby ICO the rims might be bent and become untight. Further, Whereledges or the like of a greater height are used it is preferable toprovide the plates a with a reinforcement 42, secured to the outer sideof each sieve-plate and being so arranged that they are located belowthe outer hoops e so as to fill up the space formed by the sieve-plateand the hoop in consequence of the greater height of the respectiveprojections; but instead of attaching the reinforcements o firmly to thesieve-plates a there may be special small plates similar to thereinforcements adapted to be shoved between the sieve-plate and thehoop, so as also to fill up the space before mentioned.

Having now described my invention, what -I desire to secure by a patentof the United States is 1. A rotating straining-cylinder comprising twoend pieces 1), bars 0 of cross-shape in cross-section connecting the twoend pieces together, segmental sieve-sections resting on the arms of thecross-shaped bars and havin their edges abutting top piece 1' thereofand hoops surrounding the sieve-sections and cross-bars for holding thesections in place.

2. A rotating straining-cylinder comprising two endpieces 1), bars 0 ofcross-shape in cross-section connecting the two end pieces together,segmental sieve-sections resting on the arms of the cross-shaped barsand having their ed es abutting top piece 1' thereof, reinforcing-bands1; arranged transversely on the sieve-sections and of substantially thesame height as the top piece of the cross and hoops surrounding thecylinder and resting on the said reinforcing-pieces.

In Witness whereof I have hereunto set my hand in presence of twowitnesses.

PAUL REINICKE.

Witnesses:

RUDOLPH FRIGKE, SoU'rHARD P. WARNER.

